Constraints on N2O budget changes since pre-industrial time from new firn air and ice core isotope measurements
A historical record of changes in the N2O isotope composition is important for a better understanding of the global N2O atmospheric budget. Here we have combined measurements of trapped gases in the firn and in ice cores of one Arctic site (North GReenland Ice core Project – NGRIP) and one Antarctic...
Main Authors: | , , , , , , |
---|---|
Other Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
2006
|
Subjects: | |
Online Access: | https://dspace.library.uu.nl/handle/1874/42684 |
id |
ftunivutrecht:oai:dspace.library.uu.nl:1874/42684 |
---|---|
record_format |
openpolar |
spelling |
ftunivutrecht:oai:dspace.library.uu.nl:1874/42684 2023-07-23T04:15:35+02:00 Constraints on N2O budget changes since pre-industrial time from new firn air and ice core isotope measurements Bernard, S. Röckmann, T. Kaiser, J. Barnola, j.m. Fischer, H Blunier, T. Chappellaz, J. Marine and Atmospheric Research Sub Atmospheric physics and chemistry 2006 image/pdf https://dspace.library.uu.nl/handle/1874/42684 other unknown 1680-7316 https://dspace.library.uu.nl/handle/1874/42684 info:eu-repo/semantics/OpenAccess Article 2006 ftunivutrecht 2023-07-01T23:41:32Z A historical record of changes in the N2O isotope composition is important for a better understanding of the global N2O atmospheric budget. Here we have combined measurements of trapped gases in the firn and in ice cores of one Arctic site (North GReenland Ice core Project – NGRIP) and one Antarctic site (Berkner Island). We have performed measurements of the 18O and position dependent 15N isotopic composition of N2O. By comparing these data to simulations carried out with a firn air diffusion model, we have reconstructed the temporal evolution of the N2O isotope signatures since pre-industrial times. The decrease observed for all signatures is consistent from one pole to the other. Results obtained from the air occluded in the ice suggest a decrease of about −2.8‰, −2.4‰, −3.2‰ and −1.6‰ for 15N, 1 15N, 2 15N and 18O, respectively, since 1700AD. Firn air data imply a decrease of about −1.1‰, −1.2‰, −1.0‰ and −0.6‰ for 15N, 1 15N, 2 15N and 18O, respectively, since 1970 AD. These results imply consistent trends from firn and ice measurements for 15N and 18O. The trends for the intramolecular distribution of 15N are less well constrained than the bulk 15N trends because of the larger experimental error for the position dependent 15N measurements. The decrease in the heavy isotope content of atmospheric N2O can be explained by the increasing importance of agriculture for the present atmospheric N2O budget. Article in Journal/Newspaper Antarc* Antarctic Arctic Berkner Island Greenland Greenland ice core Greenland Ice core Project ice core NGRIP North Greenland North Greenland Ice Core Project Utrecht University Repository Antarctic Arctic Berkner Island ENVELOPE(-48.117,-48.117,-79.333,-79.333) Greenland |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
unknown |
description |
A historical record of changes in the N2O isotope composition is important for a better understanding of the global N2O atmospheric budget. Here we have combined measurements of trapped gases in the firn and in ice cores of one Arctic site (North GReenland Ice core Project – NGRIP) and one Antarctic site (Berkner Island). We have performed measurements of the 18O and position dependent 15N isotopic composition of N2O. By comparing these data to simulations carried out with a firn air diffusion model, we have reconstructed the temporal evolution of the N2O isotope signatures since pre-industrial times. The decrease observed for all signatures is consistent from one pole to the other. Results obtained from the air occluded in the ice suggest a decrease of about −2.8‰, −2.4‰, −3.2‰ and −1.6‰ for 15N, 1 15N, 2 15N and 18O, respectively, since 1700AD. Firn air data imply a decrease of about −1.1‰, −1.2‰, −1.0‰ and −0.6‰ for 15N, 1 15N, 2 15N and 18O, respectively, since 1970 AD. These results imply consistent trends from firn and ice measurements for 15N and 18O. The trends for the intramolecular distribution of 15N are less well constrained than the bulk 15N trends because of the larger experimental error for the position dependent 15N measurements. The decrease in the heavy isotope content of atmospheric N2O can be explained by the increasing importance of agriculture for the present atmospheric N2O budget. |
author2 |
Marine and Atmospheric Research Sub Atmospheric physics and chemistry |
format |
Article in Journal/Newspaper |
author |
Bernard, S. Röckmann, T. Kaiser, J. Barnola, j.m. Fischer, H Blunier, T. Chappellaz, J. |
spellingShingle |
Bernard, S. Röckmann, T. Kaiser, J. Barnola, j.m. Fischer, H Blunier, T. Chappellaz, J. Constraints on N2O budget changes since pre-industrial time from new firn air and ice core isotope measurements |
author_facet |
Bernard, S. Röckmann, T. Kaiser, J. Barnola, j.m. Fischer, H Blunier, T. Chappellaz, J. |
author_sort |
Bernard, S. |
title |
Constraints on N2O budget changes since pre-industrial time from new firn air and ice core isotope measurements |
title_short |
Constraints on N2O budget changes since pre-industrial time from new firn air and ice core isotope measurements |
title_full |
Constraints on N2O budget changes since pre-industrial time from new firn air and ice core isotope measurements |
title_fullStr |
Constraints on N2O budget changes since pre-industrial time from new firn air and ice core isotope measurements |
title_full_unstemmed |
Constraints on N2O budget changes since pre-industrial time from new firn air and ice core isotope measurements |
title_sort |
constraints on n2o budget changes since pre-industrial time from new firn air and ice core isotope measurements |
publishDate |
2006 |
url |
https://dspace.library.uu.nl/handle/1874/42684 |
long_lat |
ENVELOPE(-48.117,-48.117,-79.333,-79.333) |
geographic |
Antarctic Arctic Berkner Island Greenland |
geographic_facet |
Antarctic Arctic Berkner Island Greenland |
genre |
Antarc* Antarctic Arctic Berkner Island Greenland Greenland ice core Greenland Ice core Project ice core NGRIP North Greenland North Greenland Ice Core Project |
genre_facet |
Antarc* Antarctic Arctic Berkner Island Greenland Greenland ice core Greenland Ice core Project ice core NGRIP North Greenland North Greenland Ice Core Project |
op_relation |
1680-7316 https://dspace.library.uu.nl/handle/1874/42684 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1772176444794863616 |